Ulf Jakob Flø Aarsnes

Evaluation of distributed damping subs with active control for stick–slip reduction in drilling – Geoenergy Science and Engineering 2023

Boundary Control and Estimation for Under-Balanced Drilling with Uncertain Reservoir Parameters – IEEE Transactions on Control Systems Technology 2023

Modeling and Analysis of Non-Rotating Damping Subs for Removing Torsional Vibrations in Drilling – 2022

Self-Tuning Torsional Drilling Model for Real-Time Applications – American Control Conference (ACC) 2020

A phenomenological transient model of bit foundering – Journal of Petroleum Science and Engineering 2020

Robust control design of underactuated 2× 2 PDE-ODE-PDE systems – IEEE Control Systems Letters 2020

Closed-loop tool face control with the bit off-bottom – Journal of Process Control 2020

Robust output feedback stabilization of an ODE–PDE–ODE interconnection – Automatica 2020

Axial and torsional self-excited vibrations of a distributed drill-string – Journal of Sound and Vibration 2019

Delay robust control design of under-actuated PDE-ODE-PDE systems – American Control Conference (ACC) 2019

Effect of shock subs on self-excited vibrations in drilling systems – Journal of Petroleum Science and Engineering 2019

Extremum seeking for real-time optimal drilling control – American Control Conference (ACC) 2019

Estimating friction factors while drilling – Journal of Petroleum Science and Engineering 2019

Benchmarking of Industrial Stick-Slip Mitigation Controllers – IFAC-PapersOnLine 2018

Delay-Robust Control Design for Two Heterodirectional Linear Coupled Hyperbolic PDEs – IEEE Transactions on Automatic Control 2018

Effects of latency, motor inertia and filtering on stick-slip mitigation control – 2018

ADVANCES IN CONTROL OF HYPERBOLIC PARTIAL DIFFERENTIAL EQUATIONS: OPPORTUNITIES FOR DRILLING – 2018

Stick-slip and torsional friction factors in inclined wellbores – MATEC Web of Conferences 2018

Robust output regulation of 2x 2 hyperbolic systems: Control law and Input-to-State Stability – American Control Conference (ACC) 2018

Avoiding stick slip vibrations in drilling through startup trajectory design – Journal of Process Control 2018

Flow and pressure control of underbalanced drilling operations using NMPC – Journal of Process Control 2018

Transient modeling of one-dimensional solid-liquid flow in conduits – International Journal of Multiphase Flow 2018

Dynamics of a distributed drill string system: Characteristic parameters and stability maps – Journal of Sound and Vibration 2018

Torsional vibrations with bit off bottom: Modeling, characterization and field data validation – Journal of Petroleum Science and Engineering 2018

State and Parameter Estimation of a Drift-Flux Model for Underbalanced Drilling Operations – IEEE Transactions on Control Systems Technology 2017

Review of two-phase flow models for control and estimation – Annual Reviews in Control 2016

Robust controller design for automated kick handling in managed pressure drilling – Journal of Process Control 2016

Real-time estimation of reservoir influx rate and pore pressure using a simplified transient two-phase flow model – Journal of Natural Gas Science and Engineering 2016

A simplified two-phase flow model using a quasi-equilibrium momentum balance – International Journal of Multiphase Flow 2016

Linear stability analysis of self-excited vibrations in drilling using an infinite dimensional model – Journal of Sound and Vibration 2016

A methodology for classifying operating regimes in underbalanced-drilling operations – SPE Journal 2016

Estimation of states and parameters of a drift-flux model with unscented kalman filter – IFAC-PapersOnLine 2015

A distributed parameter systems view of control problems in drilling – IFAC-PapersOnLine 2015

Fit-for-Purpose Modeling for Automation of Underbalanced Drilling Operations – 2014

CONTROL-ORIENTED DRIFT-FLUX MODELING OF SINGLE AND TWO-PHASE FLOW FOR DRILLING – 2014

Modeling and avoidance of heave-induced resonances in offshore drilling – SPE Drilling & Completion 2014

An adaptive observer for hyperbolic systems with application to UnderBalanced Drilling – Elsevier IFAC Publications / IFAC Proceedings series 2014

Limits of Controller Performance in the Heave Disturbance Attenuation Problem – 2013

Quantifying Error Introduced by Finite Order Discretization of a Hydraulic Well Model – 2012

Modeling for MPD operations with experimental validation – 2009

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